Hey guys! started building my o2 amp last night, when i realized mouser sent me the wrong front panel push buttons looked into it and their stock is completely depleted and the ones they sent were close but the leads wont fit in the holes of the pcb (different size and orientation)! oh well right?

anyway the question i had was if there were any known suppliers of these guys (besides mouser) and/or if there is a know substitution for this part... the lead time is about 10 wks from mouser!

Looks like Avnet Express, Arrow, and Onlinecomponents.com all have stock and are willing to sell in single quantities. Those vendors have other bits and pieces of the O2 BOM list. Maybe you can find some other stuff to help defray shipping. Word of warning on Arrow and Avnet through, they can ship parts from different warehouses and each incurs a shipping charge. Be sure to double check which warehouse(s) things are coming from.

Quick question guys, I've been trying to figure out this one for a while. For some reason, the O2 that I build's gain button is not working. Press and no press = same sound. I've read most of the thread and I don't think I've seen this problem come up before.

Any idea what might be wrong, or what I should check? (I don't have a multimeter). I have checked multiple times for lead shorts, but could not find any. Would bad soldering be causing any of the issues? I don't particularly have any bad solder spots as far as I know.

Quick question guys, I've been trying to figure out this one for a while. For some reason, the O2 that I build's gain button is not working. Press and no press = same sound. I've read most of the thread and I don't think I've seen this problem come up before.

Any idea what might be wrong, or what I should check? (I don't have a multimeter). I have checked multiple times for lead shorts, but could not find any. Would bad soldering be causing any of the issues? I don't particularly have any bad solder spots as far as I know.

One of the legs on the gain switch body is probably touching a pcb via or pad. Iirc back right leg if you're looking at it from the front edge of the pcb.

It's the left front leg on the body of the switch that comes too close to the via.

S2 PROBLEM – The September version of the PCB artwork (9/14/11 release) has the via between R21 and S2 located too close to the corner “foot” on S2. While most have not had any problem, it’s highly recommended to slightly bend the leg in that corner of the switch inward, or if you have some heavy cutters, trim that leg shorter (don’t use small “precision” cutters as you’ll likely damage the blades). At the least, make sure there is no contact when you’re soldering S2 in place.

Thanks Shadow. Are you saying we are not supposed to solder the two diagonal legs of the switch body?

Before proceeding to solder one has to apply some sort of insulation over the via(piece of tape,girl-friend's nail polish) so that the body of the switch doesn't touches the via.Since the switch is already soldered try raising it a bit(very carefully or you may damage the tracks) so that it doesn't touches the via.
BTW I've used jumpers (gain= 1X, 2X & 8X) to avoid this problem.
see #3147The Objective2 (O2) Headphone Amp DIY Project

Hey guys! started building my o2 amp last night, when i realized mouser sent me the wrong front panel push buttons looked into it and their stock is completely depleted and the ones they sent were close but the leads wont fit in the holes of the pcb (different size and orientation)! oh well right?

anyway the question i had was if there were any known suppliers of these guys (besides mouser) and/or if there is a know substitution for this part... the lead time is about 10 wks from mouser!

thanks for any help,

-tripwire292

You can short the appropriate points of S1/S2 & your O2 will be ON all the time(AC operation recommended) with fixed gain or I can send it to you (4 switches for 1$ plus postage) from India.

see #3147 for switches I got locally if they suit your purpose. WARNING-I didn't followed standard BOM as I'm an experienced builder myself(I repair PC/Laptop main-boards)

You can short the appropriate points of S1/S2 & your O2 will be ON all the time(AC operation recommended) with fixed gain or I can send it to you (4 switches for 1$ plus postage) from India...

if the above fails i shall pm you for more info. thanks for the offer :P

one last thing. im going to be rewiring my hps soon. wondering if anyone has a good suggestion on a raw cable that has say 10 conductors in it and is possibly the fabric material for the sheath. thickness isnt really a big deal, just as long as its not bigger than a standard 1/4" cable.